The pop star announced on her website Friday that she is postponing the remainder of her U.S. Bangerz tour as she continues to undergo treatment for her health scare.

"All remaining U.S. dates on the Miley Cyrus Bangerz tour have been postponed," the statement read. "Miley is continuing to recover from the severe allergic reaction she suffered on April 15. Existing tickets will be honored on the new dates, which include previously canceled and postponed dates. Additionally, two tour dates have been added in Pittsburgh and Chicago."

Cyrus, however, has not canceled the European leg of her tour, which is expected to "proceed as planned."

The 21-year-old singer seems to be keeping a healthy sense of humor throughout her hospital downtime: Late Friday, she posted an Instagram photo showing her wearing a duck-face oxygen mask.

"This hospitals full of a bunch of QUACKS (get it??? Quacks)," she wrote, including the hashtags: "#punnyeveninthehospy #stayinglightlovingandpositive #imissbangerztour #tryingtonotbebitter."